I think we have that but one question is not clear, so to be checked?
This drawing set:
There is a note (bubble) for an option 13X. Down in the lower right corner of the drawing it tells us that option is for an inverter? But there is no option I see for no inverter? Can we assume you DO have an inverter, making this wiring correct as shown?
Sometimes they leave us hanging a bit!
This looks to be correct as far as I can see. But I rarely trust much of anything any more!
Basic idea is that you should have three batteries for the coach items, all placed on the rack the same direction. I used black for negative to make it a bit easier to follow!
Starting at the big buss bar on the frame, a cable goes out to the outside battery, then cables from that negative post to the other negatives! From that closest battery negative post, they show two cables going to the to the inverter charger. Not showing where those land on the inverter?
Then on the positive, you need a cable from the inverter charger point that is not noted. Likely marked which goes where on that end?
Cable to big fuse holder, then other cables to connect fuse to all the positive posts and one to run to the solenoid they called "aux start solenoid" at that time. I think this is the big solenoid which is called "mode solenoid" at other times?
If not familiar with that solenoid, I think it will be under a panel out front with a label?
This drawing has info on where the battery cable lands on the large posts of the solenoid:
https://www.winnebago.com/Files/Files/Winnebago/Resources/Diagram/2005/05_p-ser_wire_148556.pdf sheet two for location and which big posts for the battery cables from chassis and coach!
See if that gets you where you need and shout back if we can lend some guesses??
With reading drawings and DIY info, I never know if I get there until I DO get there!
Wish you luck on the trek!